JPH08192523A - Impact printer - Google Patents

Abstract

PURPOSE: To shorten a printing stop time and to eliminate a data communication error by performing interval printing provided with a non-printing time at a time not exceeding specific set temp. and stopping printing at a time exceeding the specific set temp. CONSTITUTION: Prior to the printing of one line, it is judged whether or not the detection temp. Th of a thermistor 3 is higher than first set temp. T1 and, in the case not exceeding the set temp. T1, the printing of the line concerned is executed. In the case exceeding the set temp. T1, it is judged whether or not the detection temp. of the thermistor 3 exceeds second set temp. T2 (T2>T1) and, in the case not exceeding the set temp. T2, the printing of the line concerned is executed by interval one-line printing provided with a predetermined non-printing time. In the case exceeding the set temp. T2, printing is stopped to return to the first judge. The second set temp. T2 is limit temp. enabling continuous use and the first set temp. T1 is set to temp. slightly lower than T2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact printer.

[0002]

2. Description of the Related Art As disclosed in Japanese Utility Model Laid-Open No. 58-136339, in a conventional impact printer, a temperature sensor is provided on the impact head as a thermistor in order to prevent the coil from being burned due to heat generation of the impact head. When the temperature detected by the thermistor is lower than a predetermined set temperature, the printing operation is continued, and when the temperature is high, the printing is stopped until the detected temperature becomes lower than the set temperature.

[0003]

However, in the prior art, particularly when high-duty printing is performed, the printing is stopped in a short time from the start of printing, or the temperature of the impact head rises sharply. Since it takes a long time for the temperature of the impact head to once exceed the set temperature and fall below the set temperature again, it takes a long time to restart printing, and it becomes a data communication error with the host computer. However, there is a problem that the user feels uncomfortable.

[0004]

In order to solve the above problems, the impact printer of the present invention determines whether the temperature detected by the temperature sensor exceeds the first set temperature before the impact head prints. The first judgment is made, and if it is not exceeded, printing of the corresponding line is executed, and if it is exceeded, a second judgment is made as to whether the temperature detected by the temperature sensor exceeds the second set temperature. When not exceeding, the printing of the corresponding line is executed by the interval printing provided with a predetermined non-printing time, and when exceeding, the printing is stopped and the process returns to the first judgment.

[0005]

According to the present invention, when the temperature detected by the temperature sensor exceeds the first set temperature and does not reach the second set temperature, the corresponding line is printed by the interval printing provided with a predetermined non-printing time. Since the temperature rise gradient becomes smaller and the time to reach the second set temperature becomes longer because of the execution, the temperature rise gradient is smaller, so after the second set temperature is reached and printing is stopped, Since the temperature detected by the temperature sensor falls below the second set temperature in time, the time during which printing is stopped is short.

[0006]

EXAMPLES The present invention will be described in detail below based on examples.

FIG. 1 is a block diagram showing the construction of an impact printer showing an embodiment of the present invention, and FIG. 2 is a flow chart showing the operation of the impact printer showing the embodiment of the present invention. FIG. 3 is a temperature rise diagram showing the temperature rise of the impact head of the impact printer of the embodiment of the present invention.

In FIG. 1, the impact printer 100
The impact head 1 is arranged in the impact head 1. The impact head 1 is provided with a plurality of coils 2 and a thermistor 3 for detecting the temperature of the coils 2. An A / D converter 4 for converting the voltage change of the thermistor 3 into a digital amount, a CPU 5 for controlling the printing operation of the impact printer, and a printing data.
Print buffer 6 for storing data, a coil drive circuit 7 for supplying a current to the coil 2 of the impact head 1, and a CR
CR motor drive circuit 8, LF motor drive circuit 9, and I / Os 10, 11 and 1 for driving the motor and the LF motor, respectively.
2, the current Th is supplied from the power supply voltage Vcc to the thermistor 3 via the resistor 13, and the temperature Th of the coil 2 of the impact head 1 is detected from the voltage change due to the resistance change of the thermistor 3.

Next, the operation will be described with reference to FIG. Prior to the printing of one line, first, a first judgment is made as to whether or not the detected temperature Th of the thermistor 3 is higher than the first set temperature T1. When the temperature is not exceeded, one line is printed, and when it is exceeded, the temperature detected by the thermistor 3 is the second set temperature T.
2 (T2> T1) is exceeded, a second judgment is made. If it is not exceeded, the line is printed by the interval one line printing with a predetermined non-printing time, and the line is exceeded. Sometimes printing is stopped and the process returns to the first judgment.

The second set temperature T2 is a limit temperature at which continuous use is possible, and the first set temperature T1 is T2.
It is set to a temperature slightly lower than that. T2 is a temperature obtained by experiment, and in this embodiment, T2 = 100 ° C.,
T1 is set to 95 ° C.

The non-printing time during the interval printing is set to 0.1 second.

Referring to FIG. 3, the change in the detected temperature Th of the coil 2 by the thermistor 3 of this embodiment will be described in comparison with the conventional example. The set temperature for stopping the printing in the conventional example is T2 = 100 ° C., which is the same as in the present embodiment. In the first and second judgments, when Th exceeds the first set temperature 95 ° C. and does not exceed the second set temperature 100 ° C., the interval printing is performed by the interval printing provided with a predetermined non-printing time. Perform printing. By this operation, the temperature Th of the coil 2 is 95 ° C.
As the temperature rises gradually,
The time required to reach 0 ° C. is longer than that in the conventional example. As a result, the time from the start of printing to the stop of printing becomes longer than in the conventional example, and the user does not feel uncomfortable. Further, since the temperature rise gradient after the temperature exceeds 95 ° C is small, the temperature overshoot due to thermal inertia after the second set temperature 100 ° C is reached and printing is stopped is more than that of the conventional example. Since it is small, the time during which printing is stopped is shorter than that in the conventional example, no data communication error occurs with the host computer, and the user does not mistakenly think that it is out of order.

[0013]

As described above, according to the present invention, when the temperature detected by the temperature sensor exceeds the first set temperature and does not reach the second set temperature, the interface with a predetermined non-printing time is provided. -Because the printing of the corresponding line is performed by bar printing, the temperature rise gradient becomes smaller and the time to reach the second set temperature becomes longer, and since the temperature rise gradient is small, the second set temperature is reached. Then, after the printing is stopped, the temperature becomes lower than the second set temperature in a short time, so the time during which the printing is stopped becomes short and the data communication error between the host computer and It does not occur and the user does not mistakenly think that it is a failure.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an impact printer showing an embodiment of the present invention, and a flow chart showing the operation is shown in FIG.

FIG. 2 is a temperature rise diagram showing a coil temperature rise of an impact head of an impact printer showing an embodiment of the present invention.

FIG. 3 is a diagram showing changes in the detected temperature Th of the coil 2 detected by the thermistor 3.

[Explanation of symbols]

 1 Impact Head 2 Coil 3 Thermistor 4 A / D Converter 5 CPU 6 Print Buffer 7 Coil Drive Circuit 8 CR Motor Drive Circuit 9 LF Motor Drive Circuit 10 I / O 11 I / O 12 I / O 13 resistance 100 impact printer

Claims (1)

[Claims] 1. An impact head that drives an armature with an electromagnet and prints with a print wire engaged with the tip of the armature, a temperature sensor that detects the temperature of the impact head, and a temperature detected by the temperature sensor. An impact printer that performs printing line by line, including a control unit that controls the printing operation according to the above, and the temperature detected by the temperature sensor exceeds a first set temperature before the impact head performs printing. It is determined whether or not there is a first judgment, and if it is not exceeded, printing of the corresponding line is executed, and if it is exceeded, a second judgment is made as to whether or not the temperature detected by the temperature sensor exceeds the second set temperature. If it is not exceeded, the corresponding line is printed by the interval printing with a predetermined non-printing time.If it is exceeded, the printing is stopped and the previous Impact printer, characterized in that the return to the first determination.